#pragma once

#include <iostream>
#include <string>
#include <cerrno>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "Log.hpp"
#include "InetAddr.hpp"

enum
{
    SOCKET_ERROR = 1,
    BIND_ERROR,
    USAGE_ERROR
};

const static int defaultfd = -1;

class UdpServer
{
public:
    UdpServer(uint16_t port)
        : _port(port), _sockfd(defaultfd), _isrunning(false)
    {
    }
    void InitServer()
    {
        // 1. 创建udp  socket 套接字 ---> 必要
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(FATAL, "socket error , %s , %d", strerror(errno), errno);
            exit(SOCKET_ERROR);
        }
        LOG(INFO, "socket create success,sockfd: %d", _sockfd);

        // 2. 创建sockaddr_in 结构
        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);

        local.sin_addr.s_addr = INADDR_ANY;

        int n = bind(_sockfd, (struct sockaddr *)&local, sizeof(local));
        if (n < 0)
        {
            LOG(FATAL, "bind error , %s , %d", strerror(errno), errno);
            exit(BIND_ERROR);
        }
        LOG(INFO,"socket bind success");
    }
    void Start()
    {
        // 服务器一直运行 
        // UDP 面向数据报协议
        _isrunning = true;
        while(true)
        {
            char buffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);

            ssize_t n = recvfrom(_sockfd,buffer,sizeof(buffer) - 1,0,(struct sockaddr *)&peer,&len);
            if(n > 0)
            {
                buffer[n] = 0;
                InetAddr addr(peer);
                LOG(DEBUG,"get message from [%s:%d]: %s",addr.Ip().c_str(),addr.Port(),buffer);
                sendto(_sockfd,buffer,strlen(buffer),0,(struct sockaddr *)&peer, len);
            }
        }
        _isrunning = false;        
    }
    ~UdpServer()
    {
    }

private:
    int _sockfd;
    uint16_t _port; // 端口
    bool _isrunning;
};